Messages in this thread | | | Date | Mon, 12 Feb 2018 22:04:42 +0100 | From | Jiri Olsa <> | Subject | Re: [PATCH] perf: Add support for creating offline events |
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On Mon, Feb 12, 2018 at 09:42:05AM -0800, Raghavendra Rao Ananta wrote: > Hi Jiri, > > Thank you for the response. > > Does perf tool has its own check to see if the CPU was offline during the > lifetime of an event? If so, it might ignore these type of events.
nope, we don't check on that
> > Initially, I tested the same using perf tool and found similar results. > Then I debugged further and found that the perf core was actually sending > data to the userspace (copy_to_user()) and the corresponding count for the > data. Hence, I tested this further by writing my own userspace application, > and I was able to read the count through this, > even when the CPU was made offline and back online. > > Do you think we also have to modify the perf tool accordingly?
hum, I wonder what's wrong.. will check
jirka
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